The square roots of some Natural numbers.

1 * 1 = 1

2 * 2 = 4

3 * 3 = 9

4 * 4 = 16

5 * 5 = 25

6 * 6 = 36

7 * 7 = 49

8 * 8 = 64

9 * 9 = 81

10 * 10 = 100

11 * 11 = 121

12 * 12 = 144

13 * 13 = 169

14 * 14 = 196

15 * 15 = 225

16 * 16 = 256

17 * 17 = 289

18 * 18 = 324

19 * 19 = 361

20 * 20 = 400

21 * 21 = 441

22 * 22 = 484

23 * 23 = 529

24 * 24 = 576

25 * 25 = 625

26 * 26 = 676

27 * 27 = 729

28 * 28 = 784

29 * 29 = 841

30 * 30 = 900

31 * 31 = 961

32 * 32 = 1024

33 * 33 = 1089

34 * 34 = 1156

35 * 35 = 1225

36 * 36 = 1296

37 * 37 = 1369

38 * 38 = 1444

39 * 39 = 1521

40 * 40 = 1600